Look at these two (I'm not counting number 1) locations.
HKEY_CLASSES_ROOT\Folder (prob not this one - this applies to all folders incl virtual folders)
HKEY_CLASSES_ROOT\Directory (probably is this one - this applies to all real folders)
HKEY_CLASSES_ROOT\AllFilesystemObjects (if not above one will be this one - this is all real folders and all files)
McAfee probably uses a shell extension.
Under each of the above key look under the shell key and see if McAfee is there. If not look under the shellex\contextmenu key. It should have human readable description, but as this is optional it may not have. In which case make a note of the long numbers and look them up at
HKEY_CLASSES_ROOT\CLSID\<number from context menu>
Under this key will be an server key of some type probably InProcServer32, look up the file path of the server (the program that supplies the menu - nothing to do with computer servers). One will be to the McAfee folder. This is the number you want to remove.
If you had AVG av program you would find this
HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\AVG Shell Extension
@="{1E2CDF40-419B-11D2-A5A1-002018648BA7}"
and you would remove the AVG Shell Extension key. Note it could appear as
HKEY_CLASSES_ROOT\Folder\shellex\ContextMenuHandlers\{1E2CDF40-419B-11D2-A5A1-002018648BA7}
@="AVG Shell Extension"
In which case you remove the number.
Programs can use either form but they often don't bother putting in the description with the second form, meaning you have to look the number up to see what it is.
